import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

//查询操作
public class JdbcDemo4 {

    public static void main(String[] args) throws SQLException {

        //1.创造数据源
        DataSource dataSource = new MysqlDataSource();
        ((MysqlDataSource)dataSource).setUrl("jdbc:mysql://127.0.0.1:3306/test?characterEncoding=utf8&useSSL=false");
        ((MysqlDataSource)dataSource).setUser("root");
        ((MysqlDataSource)dataSource).setPassword("2003");

        //2.建立连接
        Connection connection = dataSource.getConnection();

        //3.构造sql
        String sql = "select * from student";
        PreparedStatement preparedStatement = connection.prepareStatement(sql);

        //4.执行sql
        ResultSet resultSet = preparedStatement.executeQuery();

        //5.遍历结果
        while (resultSet.next()) {
            int id = resultSet.getInt("id");
            String name = resultSet.getString("name");
            System.out.println("id= "+id+" name="+name);
        }
        //6.释放资源
        resultSet.close();
        preparedStatement.close();
        connection.close();
    }
}
